118251989 has 4 divisors (see below), whose sum is σ = 120256320. Its totient is φ = 116247660.

The previous prime is 118251971. The next prime is 118252003. The reversal of 118251989 is 989152811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989152811 = 1493 ⋅662527.

It is a cyclic number.

It is not a de Polignac number, because 118251989 - 2²⁴ = 101474773 is a prime.

It is a super-2 number, since 2×118251989² = 27967065804912242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118251919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002077 + ... + 1002194.

It is an arithmetic number, because the mean of its divisors is an integer number (30064080).

Almost surely, 2^118251989 is an apocalyptic number.

It is an amenable number.

118251989 is a deficient number, since it is larger than the sum of its proper divisors (2004331).

118251989 is an equidigital number, since it uses as much as digits as its factorization.

118251989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004330.

The product of its digits is 51840, while the sum is 44.

The square root of 118251989 is about 10874.3730393986. The cubic root of 118251989 is about 490.8357097770.

The spelling of 118251989 in words is "one hundred eighteen million, two hundred fifty-one thousand, nine hundred eighty-nine".